US20140328051A1 - Display device - Google Patents
Display device Download PDFInfo
- Publication number
- US20140328051A1 US20140328051A1 US14/357,179 US201214357179A US2014328051A1 US 20140328051 A1 US20140328051 A1 US 20140328051A1 US 201214357179 A US201214357179 A US 201214357179A US 2014328051 A1 US2014328051 A1 US 2014328051A1
- Authority
- US
- United States
- Prior art keywords
- case
- liquid crystal
- display device
- crystal display
- display panel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/08—Fastening or securing by means not forming part of the material of the label itself
- G09F3/10—Fastening or securing by means not forming part of the material of the label itself by an adhesive layer
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133314—Back frames
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133317—Intermediate frames, e.g. between backlight housing and front frame
-
- G02F2001/133317—
Definitions
- the present invention relates to a display device that displays an image by radiating light on an object to be illuminated such as a liquid crystal display panel, for example.
- the conventional liquid crystal display device disclosed in Patent Document 1 includes a main liquid crystal panel as a display panel, a backlight that radiates light on the main liquid crystal panel, and a case that encloses the main liquid crystal panel and the backlight.
- the case encloses the backlight disposed opposite to the display surface side of the main liquid crystal panel while covering the region of the main liquid crystal panel opposite to the display surface side.
- Patent Document 1 Japanese Patent Application Laid-Open Publication No. 2007-171738
- the conventional display device does not address the reduction of weight.
- reducing the weight of the display device by adding protrusions and recesses to the case in order to the increase the strength thereof is not possible.
- the present invention takes into account the above-mentioned problem, and an object thereof is to provide a display device for which it is possible to simultaneously increase the strength and decrease the weight thereof.
- a display device of the present invention includes: a display panel that displays an image; and a case that is disposed on a side of the display panel opposite to a display surface side thereof, the case covering the side of the display panel opposite to the display surface side, wherein the case has formed therein a plurality of holes that penetrate the case from outside the case to inside the case with edges of the holes having projections that protrude from an inner surface of the case towards an interior of the case.
- the case of the display device includes a plurality of holes and thus the weight is reduced. Furthermore, the edges of the holes in the case of the display device have projections, thus increasing the resistance of the case to bending, warping, and the like.
- the “display surface” refers to the surface of the display panel that displays images and the like.
- each of the projections is bent outward in a radial direction of each of the holes such that tips of the projections face the inner surface of the case.
- the tips of the projections are rolled towards the inner surface of the case, for example, which further increases the resistance of the case of the display device to bending, warping, and the like.
- an illumination unit that is disposed between the display panel and the case and that radiates light towards the display panel is further included, wherein the projections are in contact with a surface of the illumination unit facing the case.
- a substrate that is disposed inside the case and that exchanges signals with the display panel is further included, wherein the projections are in contact with a surface of the illumination unit facing the case.
- the substrate and the case are electrically connected.
- a grounding terminal of the substrate is electrically connected to the case.
- the case is made of sheet metal and the projections are made by curling the sheet metal.
- holes can be formed with ease in the case made of sheet metal, and the projections can be formed with ease by curling.
- the case of the display device includes a plurality of holes and projections in the edges of the holes, and thus, the weight is reduced while resistance to bending, warping, and the like is strengthened.
- the display device it is possible to provide a display device in which it is possible to simultaneously increase the strength and decrease the weight.
- FIG. 1 is an exploded perspective view of a liquid crystal display device (display device) according to Embodiment 1 of the present invention.
- FIG. 2 is a magnified perpendicular cross-sectional view showing a portion of the liquid crystal display device according to Embodiment 1.
- FIG. 3 is a bottom view of the liquid crystal display device according to Embodiment 1.
- FIG. 4 is a magnified perpendicular cross-sectional view showing a portion of a case of the liquid crystal display device according to Embodiment 1.
- FIG. 5 is a bottom view of a liquid crystal display device according to Embodiment 2 of the present invention.
- Embodiments of the present invention will be described below with reference to FIGS. 1 to 5 .
- a liquid crystal display device will be described as an example of a display device of the present invention.
- FIG. 1 is an exploded perspective view of the liquid crystal display device
- FIG. 2 is a magnified perpendicular cross-sectional view of a portion of the liquid crystal display device.
- the upper side of FIGS. 1 and 2 is the display surface side of the liquid crystal display panel described later.
- a liquid crystal display device 1 is a display device that uses liquid crystal to display images, and has a substantially rectangular shape in a plan view that is longer in the left-and-right direction.
- the liquid crystal display device 1 includes a liquid crystal display panel 10 as a display panel and a backlight unit 20 that is an illumination unit as shown in FIGS. 1 and 2 .
- the liquid crystal display panel 10 and the backlight unit 20 are supported by a case 2 .
- the liquid crystal display panel 10 includes an active matrix substrate 11 , a color filter substrate 12 and polarizing plates 13 .
- the color filter substrate 12 is sometimes simply referred to as an opposite substrate.
- the active matrix substrate 11 is disposed opposite to the color filter substrate 12 disposed on the display surface side of the liquid crystal display panel 10 .
- the active matrix substrate 11 includes, on a prescribed surface thereof, switching elements made of TFTs (thin film transistors), pixel electrodes, and common electrodes, which are not shown.
- TFTs thin film transistors
- pixel electrodes and the common electrodes are interdigital electrodes that form pairs.
- the active matrix substrate 11 and the color filter substrate 12 are respectively covered by alignment films (not shown) that have prescribed respective surfaces that orient the liquid crystal in a specific direction.
- the active matrix substrate 11 and the color filter substrate 12 are bonded together by a sealing member (not shown) such that the prescribed surfaces thereof face each other. Liquid crystal is sandwiched between the active matrix substrate 11 and the color filter substrate 12 , and is sealed in the space surrounded by the sealing member.
- the polarizing plates 13 are bonded to respective surfaces of the active matrix substrate 11 and the color filter substrate 12 , the surfaces being opposite to the prescribed surfaces where the liquid crystal is sealed.
- the polarizing plates 13 are sheets through which only light waves oscillating in a specific direction are allowed through, and the two polarizing plates 13 are respectively bonded such that the transmission axes thereof are offset by approximately 90°.
- a control circuit 14 is provided outside of the area where the active matrix substrate 11 and the color filter substrate 12 face each other.
- the control circuit 14 controls an electric field generated between the pixel electrodes and the common electrodes on the basis of an image signal in order to adjust the orientation of the liquid crystal.
- the control circuit 14 has a flexible printed circuit board 15 provided on the outside thereof.
- the flexible printed circuit board 15 bends in order to electrically connect the liquid crystal display panel 10 and the backlight unit 20 , and extends from the display surface side of the liquid crystal display panel 10 to the inner side of the case 2 .
- the flexible printed circuit board 15 transfers signals between the liquid crystal display panel 10 , the backlight unit 20 , and the like.
- the liquid crystal display panel 10 configured in this manner adjusts the orientation of the liquid crystal by an electric field generated between the pixel electrodes and the common electrodes in the active matrix substrate 11 on the basis of an image signal, thus changing the transmittance of light through the liquid crystal layer.
- the liquid crystal display panel 10 is of a transverse field type as described above, for example, and causes liquid crystal molecules to rotate within a plane parallel to the main substrate surface by generating an electric field parallel to the main surface of the active matrix substrate 11 .
- the backlight unit 20 is a module for emitting backlight for the liquid crystal display panel 10 , and is an edge-lit illumination device, for example.
- the backlight unit 20 is disposed on the rear surface side (lower side in FIGS. 1 and 2 ) of the liquid crystal display panel 10 housed within the case 2 .
- the backlight unit 20 includes a light-emitting portion 21 , a light guide plate 22 , a diffusion plate 23 , a prism sheet 24 , a lens sheet 25 , and a reflective sheet 26 .
- the light-emitting portion 21 includes a plurality of white LEDs (light emitting diodes) that emit white light, for example.
- the plurality of LEDs are disposed along a side of the light guide plate 22 such that the light-emitting direction thereof faces one edge face of the light guide plate 22 .
- the edge face of the light guide plate 22 mentioned here is a face formed so as to be substantially perpendicular to the upper main surface of the light guide plate 22 , which is a main surface, that faces the surface of the liquid crystal display panel 10 opposite to the display surface, or in other words, the rear surface of the liquid crystal display panel 10 .
- LEDs are not limited to those that emit white light, and light sources other than LEDs may be used for the light-emitting portion 21 .
- the light-emitting portion 21 may be disposed facing two or more edge faces of the light guide plate 22 .
- the light guide plate 22 is substantially rectangular in a plan view, and is made of a transparent resin such as acrylic or polycarbonate.
- the light guide plate 22 receives light radiated from the light-emitting portion 21 at one of the four edge faces.
- the upper main surface which is substantially perpendicular to the edge face receiving light from the light-emitting portion 21 and is a main surface facing the rear surface of the liquid crystal display panel 10 , radiates light towards the liquid crystal display device 10 .
- the diffusion plate 23 , the prism sheet 24 , and the lens sheet 25 are disposed on the upper main surface of the light guide plate 22 so as to cover the light guide plate 22 from the liquid crystal display panel 10 side.
- the diffusion plate 23 is disposed closest to the light guide plate 22 , and directly receives light radiated from the light guide plate 22 .
- the diffusion plate 23 is disposed such that the light-receiving surface that receives light from the light guide plate 22 faces the upper main surface of the light guide plate 22 .
- the diffusion plate 23 diffuses light received from the light guide plate 22 , and causes the light to spread across the entire liquid crystal display panel 10 .
- the prism sheet 24 is disposed on the diffusion plate 23 , towards the liquid crystal display panel 10 .
- the prism sheet 24 has triangular prisms, for example, that extend in a linear fashion in one direction and are aligned in a direction that intersects the one direction in the sheet surface.
- the prism sheet 24 polarizes the radiating characteristics of light from the diffusion plate 23 .
- the lens sheet 25 is provided on the prism sheet 24 , towards the liquid crystal display panel 10 .
- the lens sheet 25 has spread therein microparticles that refract and disperse light.
- the lens sheet 25 mitigates differences in brightness that are variations in amount of light without causing light from the prism sheet 24 to concentrate in one area.
- the reflective sheet 26 is disposed on the lower main surface of the light guide plate 22 so as to cover the light guide plate 22 from the side thereof opposite to the liquid crystal display panel 10 .
- the reflective sheet 26 reflects some of the light that might otherwise be emitted from the lower main surface of the light guide plate 22 back towards the upper main surface of the light guide plate 22 .
- the reflective sheet 26 increases the brightness of the light guide plate 22 .
- the backlight unit 20 having such a configuration emits an even planar backlight so as to illuminate the rear surface of the liquid crystal display panel 10 .
- the liquid crystal display panel 10 changes the transmittance of backlight passing through the liquid crystal on the basis of the image signal, and thus, a desired image is displayed on the display surface of the liquid crystal display panel 10 .
- the case 2 is made of sheet metal, and is formed into a box shape forming a substantially rectangular shape in a plan view, with an open top.
- the case 2 includes a liquid crystal display panel 10 in the vicinity of the opening, is disposed on the side of the liquid crystal display panel 10 opposite to the display surface side so as to cover the side of the liquid crystal display panel 10 opposite to the display surface side.
- the interior of the case 2 or in other words, the inner bottom surface houses the backlight unit 20 .
- FIG. 3 is a bottom view of the liquid crystal display device 1
- FIG. 4 is a magnified perpendicular cross-sectional view of a portion of the case 2 of the liquid crystal display device 1 .
- the case 2 has a plurality of holes 3 formed in the bottom thereof as shown in FIGS. 1 and 2 .
- the holes 3 are circular, and penetrate from the outside to the inside of the case 2 .
- the plurality of holes 3 are aligned in a rectangular shape along the edges of the rectangular case 2 as shown in FIG. 3 .
- projections 3 a are provided as shown in FIGS. 1 , 2 , and 4 .
- the projections 3 a protrude towards the inner side from the inner surface of the case 2 .
- tips of the projections 3 a bend towards the outside the holes 3 in the radial direction so as to face the inner surface side of the case 2 .
- the case 2 is made of sheet metal, and thus, the projections 3 a are formed by curling the sheet metal.
- the projections 3 a of some of the holes 3 have edges that are in contact with a surface of the flexible printed circuit board 15 facing the case 2 , the edges being furthest inside the case 2 . Also, as shown in FIG. 2 , some of the projections 3 a of the holes 3 have edges that are in contact with a surface of the backlight unit 20 facing the case 2 , or in other words the reflective sheet 26 , the edges being furthest inside the case 2 .
- the case 2 of the liquid crystal display device 1 includes a plurality of holes 3 that penetrate from the outside to the inside of the case 2 , and edges of the holes 3 include projections 3 a that protrude from the inner surface towards the inside.
- the case 2 has a reduced weight due to the plurality of holes 3 , and due to the holes 3 having projections 3 a on the edges thereof, the case 2 is more resistant to bending, warping, and the like. Thus, it is possible to simultaneously increase the strength and decrease the weight of the liquid crystal display device 1 .
- the tips of the projections 3 a are bent towards the outside of the holes 3 in the radial direction so as to face the inner surface of the case 2 , and by rolling the tips towards the inner surface of the case 2 as described above, the case 2 is further strengthened so as to resist bending, warping, and the like.
- the projections 3 a By providing the projections 3 a, there is a risk that a gap would form between the backlight unit 20 and the inner surface of the case 2 .
- the projections 3 a be in contact with the surface of the backlight unit 20 facing the case 2 , or in other words, the reflective sheet 26 , the one surface of the reflective sheet 26 of the backlight unit 20 can be supported.
- the projections 3 a are also in contact with a surface of the flexible printed circuit board 15 facing the case 2 , and thus, the case 2 and the flexible printed circuit board 15 are electrically connected. Thus, it is possible to electrically connect a grounding terminal (not shown) of the flexible printed circuit board 15 to the case 2 . Therefore, it is possible to stabilize the operation of the control circuit.
- the case 2 is made of sheet metal 2 and the projections 3 a are formed by curling up the sheet metal.
- the holes 3 can be made to penetrate the case 2 made of the sheet metal with ease, and the projections 3 a can be formed in a simple manner by curling.
- the case 2 of the liquid crystal display device 1 has a plurality of holes 3 and projections 3 a provided in the edges of the holes 3 , thus reducing the weight and increasing resistance to bending, warping, and the like.
- the liquid crystal display device 1 it is possible to provide the liquid crystal display device 1 in which it is possible to simultaneously increase the strength and decrease the weight.
- FIG. 5 is a bottom view of the liquid crystal display device.
- the basic configuration of the present embodiment is the same as that described in Embodiment 1 with reference to FIGS. 1 to 4 , and thus, components in common with Embodiment 1 are assigned the same reference characters, and drawings and descriptions thereof will be omitted.
- a case 2 in a liquid crystal display device 1 of Embodiment 2 includes a plurality of holes 4 in the bottom thereof as shown in FIG. 5 .
- the holes 4 are polygonal, that is octagonal, and penetrate from the outside to the inside of the case 2 .
- the plurality of holes 4 are substantially arranged in a grid pattern throughout the entire bottom surface of the rectangular case 2 .
- the edges of the respective holes 4 are provided with projections (not shown) that protrude from the inner surface of the case 2 towards the inside.
- the weight can be reduced by provided the case 2 with the plurality of holes 4 , and by provided projections in the edges of the holes 4 , the case 2 can be strengthened to increase resistance from bending, warping, and the like, as in Embodiment 1.
- the holes 3 or 4 provided in the case 2 were circular or octagonal, but the shape of the holes is not limited thereto, and may have another type of polygonal shape or an elliptical shape.
- the case 2 may include holes of a plurality of different shapes.
- the holes 3 or 4 are arranged in a rectangular shape or in a grid pattern on the bottom surface of the case 2 , but the holes are not limited to being disposed in these arrangements, and may have another arrangement such as being disposed at random, for example. Also, the size and number of holes 3 and 4 are not limited to the size and number in the embodiments above, and the holes may be of a plurality of sizes and shapes, for example.
- the present invention can be used a display device that displays an image by radiating light on an object to be illuminated such as a liquid crystal display panel, for example.
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
A liquid crystal display device 1 is provided with a liquid crystal display panel 10, which displays an image, and a case 2, which is disposed on the side of the liquid crystal display panel 10 opposite to the display surface side, and covers the side of the liquid crystal display panel 10 opposite to the display surface side. The case 2 includes a plurality of holes 3 that penetrate from the outside to the inside of the case 2, and edges of the holes 3 include projections 3 a that protrude from the inner surface of the case 2 towards the inside thereof.
Description
- The present invention relates to a display device that displays an image by radiating light on an object to be illuminated such as a liquid crystal display panel, for example.
- As display devices, liquid crystal display devices having liquid crystal display panels are widely used, and a conventional technique pertaining thereto is disclosed in
Patent Document 1. - The conventional liquid crystal display device disclosed in
Patent Document 1 includes a main liquid crystal panel as a display panel, a backlight that radiates light on the main liquid crystal panel, and a case that encloses the main liquid crystal panel and the backlight. The case encloses the backlight disposed opposite to the display surface side of the main liquid crystal panel while covering the region of the main liquid crystal panel opposite to the display surface side. - Here, a problem is that as liquid crystal display devices have become thinner in recent years, the strength of the liquid crystal display device has decreased as a result. There is an increased risk that, in mobile information devices such as mobile phones and PDAs, the liquid crystal display panels thereof receive damage due to a strong external force being applied thereto due to falls, pressure, or the like. The case in the conventional liquid crystal display device disclosed in
Patent Document 1 is given protrusions and recesses, thereby increasing the strength of the liquid crystal display device. - Patent Document 1: Japanese Patent Application Laid-Open Publication No. 2007-171738
- However, while increased strength and lighter weight are in demand for recent display devices, the conventional display device does not address the reduction of weight. Thus, there was a possibility that reducing the weight of the display device by adding protrusions and recesses to the case in order to the increase the strength thereof is not possible.
- The present invention takes into account the above-mentioned problem, and an object thereof is to provide a display device for which it is possible to simultaneously increase the strength and decrease the weight thereof.
- In order to solve the above-mentioned problems, a display device of the present invention includes: a display panel that displays an image; and a case that is disposed on a side of the display panel opposite to a display surface side thereof, the case covering the side of the display panel opposite to the display surface side, wherein the case has formed therein a plurality of holes that penetrate the case from outside the case to inside the case with edges of the holes having projections that protrude from an inner surface of the case towards an interior of the case.
- According to this configuration, the case of the display device includes a plurality of holes and thus the weight is reduced. Furthermore, the edges of the holes in the case of the display device have projections, thus increasing the resistance of the case to bending, warping, and the like. Here, the “display surface” refers to the surface of the display panel that displays images and the like.
- In the display device configured as described above, each of the projections is bent outward in a radial direction of each of the holes such that tips of the projections face the inner surface of the case.
- According to this configuration, the tips of the projections are rolled towards the inner surface of the case, for example, which further increases the resistance of the case of the display device to bending, warping, and the like.
- In the display device configured as described above, an illumination unit that is disposed between the display panel and the case and that radiates light towards the display panel is further included, wherein the projections are in contact with a surface of the illumination unit facing the case.
- Although there is a risk that providing projections would result in a gap between the illumination unit and the inner surface of the case, according to this configuration, the surface of the illumination unit facing the case is supported by the projections. As a result, thermal expansion in the surface of the illumination unit facing the case is mitigated.
- In the display device configured as described above, a substrate that is disposed inside the case and that exchanges signals with the display panel is further included, wherein the projections are in contact with a surface of the illumination unit facing the case.
- According to this configuration, the substrate and the case are electrically connected. As a result, a grounding terminal of the substrate is electrically connected to the case.
- In the display device configured as described above, the case is made of sheet metal and the projections are made by curling the sheet metal.
- According to this configuration, holes can be formed with ease in the case made of sheet metal, and the projections can be formed with ease by curling.
- According to the configuration of the present invention, the case of the display device includes a plurality of holes and projections in the edges of the holes, and thus, the weight is reduced while resistance to bending, warping, and the like is strengthened. Thus, it is possible to provide a display device in which it is possible to simultaneously increase the strength and decrease the weight.
-
FIG. 1 is an exploded perspective view of a liquid crystal display device (display device) according toEmbodiment 1 of the present invention. -
FIG. 2 is a magnified perpendicular cross-sectional view showing a portion of the liquid crystal display device according toEmbodiment 1. -
FIG. 3 is a bottom view of the liquid crystal display device according toEmbodiment 1. -
FIG. 4 is a magnified perpendicular cross-sectional view showing a portion of a case of the liquid crystal display device according toEmbodiment 1. -
FIG. 5 is a bottom view of a liquid crystal display device according toEmbodiment 2 of the present invention. - Embodiments of the present invention will be described below with reference to
FIGS. 1 to 5 . Here, a liquid crystal display device will be described as an example of a display device of the present invention. - First, the overall structure of a liquid crystal display device of
Embodiment 1 of the present invention will be described with reference toFIGS. 1 and 2 .FIG. 1 is an exploded perspective view of the liquid crystal display device, andFIG. 2 is a magnified perpendicular cross-sectional view of a portion of the liquid crystal display device. The upper side ofFIGS. 1 and 2 is the display surface side of the liquid crystal display panel described later. - A liquid
crystal display device 1 is a display device that uses liquid crystal to display images, and has a substantially rectangular shape in a plan view that is longer in the left-and-right direction. The liquidcrystal display device 1 includes a liquidcrystal display panel 10 as a display panel and abacklight unit 20 that is an illumination unit as shown inFIGS. 1 and 2 . The liquidcrystal display panel 10 and thebacklight unit 20 are supported by acase 2. - The liquid
crystal display panel 10 includes anactive matrix substrate 11, acolor filter substrate 12 and polarizingplates 13. Thecolor filter substrate 12 is sometimes simply referred to as an opposite substrate. - The
active matrix substrate 11 is disposed opposite to thecolor filter substrate 12 disposed on the display surface side of the liquidcrystal display panel 10. Theactive matrix substrate 11 includes, on a prescribed surface thereof, switching elements made of TFTs (thin film transistors), pixel electrodes, and common electrodes, which are not shown. The pixel electrodes and the common electrodes are interdigital electrodes that form pairs. - The
active matrix substrate 11 and thecolor filter substrate 12 are respectively covered by alignment films (not shown) that have prescribed respective surfaces that orient the liquid crystal in a specific direction. - The
active matrix substrate 11 and thecolor filter substrate 12 are bonded together by a sealing member (not shown) such that the prescribed surfaces thereof face each other. Liquid crystal is sandwiched between theactive matrix substrate 11 and thecolor filter substrate 12, and is sealed in the space surrounded by the sealing member. - The polarizing
plates 13 are bonded to respective surfaces of theactive matrix substrate 11 and thecolor filter substrate 12, the surfaces being opposite to the prescribed surfaces where the liquid crystal is sealed. The polarizingplates 13 are sheets through which only light waves oscillating in a specific direction are allowed through, and the two polarizingplates 13 are respectively bonded such that the transmission axes thereof are offset by approximately 90°. - A
control circuit 14 is provided outside of the area where theactive matrix substrate 11 and thecolor filter substrate 12 face each other. Thecontrol circuit 14 controls an electric field generated between the pixel electrodes and the common electrodes on the basis of an image signal in order to adjust the orientation of the liquid crystal. - The
control circuit 14 has a flexible printedcircuit board 15 provided on the outside thereof. The flexible printedcircuit board 15 bends in order to electrically connect the liquidcrystal display panel 10 and thebacklight unit 20, and extends from the display surface side of the liquidcrystal display panel 10 to the inner side of thecase 2. The flexible printedcircuit board 15 transfers signals between the liquidcrystal display panel 10, thebacklight unit 20, and the like. - The liquid
crystal display panel 10 configured in this manner adjusts the orientation of the liquid crystal by an electric field generated between the pixel electrodes and the common electrodes in theactive matrix substrate 11 on the basis of an image signal, thus changing the transmittance of light through the liquid crystal layer. The liquidcrystal display panel 10 is of a transverse field type as described above, for example, and causes liquid crystal molecules to rotate within a plane parallel to the main substrate surface by generating an electric field parallel to the main surface of theactive matrix substrate 11. - The
backlight unit 20 is a module for emitting backlight for the liquidcrystal display panel 10, and is an edge-lit illumination device, for example. Thebacklight unit 20 is disposed on the rear surface side (lower side inFIGS. 1 and 2 ) of the liquidcrystal display panel 10 housed within thecase 2. Thebacklight unit 20 includes a light-emittingportion 21, alight guide plate 22, adiffusion plate 23, aprism sheet 24, alens sheet 25, and areflective sheet 26. - The light-emitting
portion 21 includes a plurality of white LEDs (light emitting diodes) that emit white light, for example. The plurality of LEDs are disposed along a side of thelight guide plate 22 such that the light-emitting direction thereof faces one edge face of thelight guide plate 22. The edge face of thelight guide plate 22 mentioned here is a face formed so as to be substantially perpendicular to the upper main surface of thelight guide plate 22, which is a main surface, that faces the surface of the liquidcrystal display panel 10 opposite to the display surface, or in other words, the rear surface of the liquidcrystal display panel 10. Also, LEDs are not limited to those that emit white light, and light sources other than LEDs may be used for the light-emittingportion 21. The light-emittingportion 21 may be disposed facing two or more edge faces of thelight guide plate 22. - The
light guide plate 22 is substantially rectangular in a plan view, and is made of a transparent resin such as acrylic or polycarbonate. Thelight guide plate 22 receives light radiated from the light-emittingportion 21 at one of the four edge faces. In thelight guide plate 22, the upper main surface, which is substantially perpendicular to the edge face receiving light from the light-emittingportion 21 and is a main surface facing the rear surface of the liquidcrystal display panel 10, radiates light towards the liquidcrystal display device 10. - The
diffusion plate 23, theprism sheet 24, and thelens sheet 25 are disposed on the upper main surface of thelight guide plate 22 so as to cover thelight guide plate 22 from the liquidcrystal display panel 10 side. - Among the
diffusion plate 23, theprism sheet 24, and thelens sheet 25, thediffusion plate 23 is disposed closest to thelight guide plate 22, and directly receives light radiated from thelight guide plate 22. Thediffusion plate 23 is disposed such that the light-receiving surface that receives light from thelight guide plate 22 faces the upper main surface of thelight guide plate 22. Thediffusion plate 23 diffuses light received from thelight guide plate 22, and causes the light to spread across the entire liquidcrystal display panel 10. - The
prism sheet 24 is disposed on thediffusion plate 23, towards the liquidcrystal display panel 10. Theprism sheet 24 has triangular prisms, for example, that extend in a linear fashion in one direction and are aligned in a direction that intersects the one direction in the sheet surface. Theprism sheet 24 polarizes the radiating characteristics of light from thediffusion plate 23. - The
lens sheet 25 is provided on theprism sheet 24, towards the liquidcrystal display panel 10. Thelens sheet 25 has spread therein microparticles that refract and disperse light. Thelens sheet 25 mitigates differences in brightness that are variations in amount of light without causing light from theprism sheet 24 to concentrate in one area. - On the other hand, the
reflective sheet 26 is disposed on the lower main surface of thelight guide plate 22 so as to cover thelight guide plate 22 from the side thereof opposite to the liquidcrystal display panel 10. Thereflective sheet 26 reflects some of the light that might otherwise be emitted from the lower main surface of thelight guide plate 22 back towards the upper main surface of thelight guide plate 22. Thereflective sheet 26 increases the brightness of thelight guide plate 22. - The
backlight unit 20 having such a configuration emits an even planar backlight so as to illuminate the rear surface of the liquidcrystal display panel 10. The liquidcrystal display panel 10 changes the transmittance of backlight passing through the liquid crystal on the basis of the image signal, and thus, a desired image is displayed on the display surface of the liquidcrystal display panel 10. - The
case 2 is made of sheet metal, and is formed into a box shape forming a substantially rectangular shape in a plan view, with an open top. Thecase 2 includes a liquidcrystal display panel 10 in the vicinity of the opening, is disposed on the side of the liquidcrystal display panel 10 opposite to the display surface side so as to cover the side of the liquidcrystal display panel 10 opposite to the display surface side. The interior of thecase 2, or in other words, the inner bottom surface houses thebacklight unit 20. - Next, a detailed configuration of the
case 2 will be described with reference toFIGS. 1 to 4 .FIG. 3 is a bottom view of the liquidcrystal display device 1, andFIG. 4 is a magnified perpendicular cross-sectional view of a portion of thecase 2 of the liquidcrystal display device 1. - The
case 2 has a plurality ofholes 3 formed in the bottom thereof as shown inFIGS. 1 and 2 . Theholes 3 are circular, and penetrate from the outside to the inside of thecase 2. The plurality ofholes 3 are aligned in a rectangular shape along the edges of therectangular case 2 as shown inFIG. 3 . - In the edges of the
respective holes 3,projections 3a are provided as shown inFIGS. 1 , 2, and 4. Theprojections 3a protrude towards the inner side from the inner surface of thecase 2. In addition, tips of theprojections 3a bend towards the outside theholes 3 in the radial direction so as to face the inner surface side of thecase 2. Thecase 2 is made of sheet metal, and thus, theprojections 3a are formed by curling the sheet metal. - As shown in
FIGS. 2 and 4 , theprojections 3a of some of theholes 3 have edges that are in contact with a surface of the flexible printedcircuit board 15 facing thecase 2, the edges being furthest inside thecase 2. Also, as shown inFIG. 2 , some of theprojections 3 a of theholes 3 have edges that are in contact with a surface of thebacklight unit 20 facing thecase 2, or in other words thereflective sheet 26, the edges being furthest inside thecase 2. - As described above, the
case 2 of the liquidcrystal display device 1 includes a plurality ofholes 3 that penetrate from the outside to the inside of thecase 2, and edges of theholes 3 includeprojections 3a that protrude from the inner surface towards the inside. Thecase 2 has a reduced weight due to the plurality ofholes 3, and due to theholes 3 havingprojections 3 a on the edges thereof, thecase 2 is more resistant to bending, warping, and the like. Thus, it is possible to simultaneously increase the strength and decrease the weight of the liquidcrystal display device 1. - Furthermore, the tips of the
projections 3a are bent towards the outside of theholes 3 in the radial direction so as to face the inner surface of thecase 2, and by rolling the tips towards the inner surface of thecase 2 as described above, thecase 2 is further strengthened so as to resist bending, warping, and the like. - By providing the
projections 3 a, there is a risk that a gap would form between thebacklight unit 20 and the inner surface of thecase 2. However, by having theprojections 3a be in contact with the surface of thebacklight unit 20 facing thecase 2, or in other words, thereflective sheet 26, the one surface of thereflective sheet 26 of thebacklight unit 20 can be supported. Thus, it is possible to mitigate thermal expansion in thereflective sheet 26. Therefore, wrinkling in thereflective sheet 26 is prevented, thus preventing a decrease in brightness in thebacklight unit 20. - The
projections 3a are also in contact with a surface of the flexible printedcircuit board 15 facing thecase 2, and thus, thecase 2 and the flexible printedcircuit board 15 are electrically connected. Thus, it is possible to electrically connect a grounding terminal (not shown) of the flexible printedcircuit board 15 to thecase 2. Therefore, it is possible to stabilize the operation of the control circuit. - Also, in the liquid
crystal display device 1, thecase 2 is made ofsheet metal 2 and theprojections 3a are formed by curling up the sheet metal. In other words, theholes 3 can be made to penetrate thecase 2 made of the sheet metal with ease, and theprojections 3 a can be formed in a simple manner by curling. - According to the configuration of the embodiment of the present invention above, the
case 2 of the liquidcrystal display device 1 has a plurality ofholes 3 andprojections 3 a provided in the edges of theholes 3, thus reducing the weight and increasing resistance to bending, warping, and the like. Thus, it is possible to provide the liquidcrystal display device 1 in which it is possible to simultaneously increase the strength and decrease the weight. - Next, a liquid crystal display device according to
Embodiment 2 of the present invention will be described with reference toFIG. 5 .FIG. 5 is a bottom view of the liquid crystal display device. The basic configuration of the present embodiment is the same as that described inEmbodiment 1 with reference toFIGS. 1 to 4 , and thus, components in common withEmbodiment 1 are assigned the same reference characters, and drawings and descriptions thereof will be omitted. - A
case 2 in a liquidcrystal display device 1 ofEmbodiment 2 includes a plurality ofholes 4 in the bottom thereof as shown inFIG. 5 . Theholes 4 are polygonal, that is octagonal, and penetrate from the outside to the inside of thecase 2. The plurality ofholes 4 are substantially arranged in a grid pattern throughout the entire bottom surface of therectangular case 2. The edges of therespective holes 4 are provided with projections (not shown) that protrude from the inner surface of thecase 2 towards the inside. - As described above, even if the plurality of
holes 4 provided in thecase 2 are octagonal, the weight can be reduced by provided thecase 2 with the plurality ofholes 4, and by provided projections in the edges of theholes 4, thecase 2 can be strengthened to increase resistance from bending, warping, and the like, as inEmbodiment 1. Thus, it is possible to simultaneously increase the strength and decrease the weight of the liquidcrystal display device 1. - Embodiments of the present invention were described above, but the scope of the present invention is not limited thereto, and can be implemented with various modifications without departing from the spirit thereof.
- For example, in the embodiments of the present invention, the
holes case 2 were circular or octagonal, but the shape of the holes is not limited thereto, and may have another type of polygonal shape or an elliptical shape. Also, thecase 2 may include holes of a plurality of different shapes. - In addition, in the embodiments of the present invention, the
holes case 2, but the holes are not limited to being disposed in these arrangements, and may have another arrangement such as being disposed at random, for example. Also, the size and number ofholes - The present invention can be used a display device that displays an image by radiating light on an object to be illuminated such as a liquid crystal display panel, for example.
-
- 1 liquid crystal display device (display device)
- 2 case
- 3, 4 hole
- 3 a projection
- 10 liquid crystal display panel (display panel)
- 15 flexible printed circuit board (substrate)
- 20 backlight unit (illumination part)
- 26 reflective sheet
Claims (5)
1. A display device, comprising:
a display panel that displays an image; and
a case that is disposed on a side of the display panel opposite to a display surface side thereof,
wherein the case has formed therein a plurality of holes that penetrate the case with edges of the holes having projections that protrude from an inner surface of the case towards an interior of the case.
2. The display device according to claim 1 , wherein each of the projections is bent outward in a radial direction of each of the holes such that tips of the projections face the inner surface of the case.
3. The display device according to claim 1 , further comprising an illumination unit that is disposed between the display panel and the case and that radiates light towards the display panel,
wherein the projections are in contact with a surface of the illumination unit facing the case.
4. The display device according to claim 1 , further comprising a substrate that is disposed inside the case and that exchanges signals with the display panel,
wherein the projections are in contact with a surface of the substrate facing the case.
5. The display device according to claim 1 , wherein the case is made of sheet metal and the projections are made by curling the edges of the holes formed in the sheet metal.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011247553 | 2011-11-11 | ||
JP2011-247553 | 2011-11-11 | ||
PCT/JP2012/078567 WO2013069584A1 (en) | 2011-11-11 | 2012-11-05 | Display device |
Publications (1)
Publication Number | Publication Date |
---|---|
US20140328051A1 true US20140328051A1 (en) | 2014-11-06 |
Family
ID=48289958
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/357,179 Abandoned US20140328051A1 (en) | 2011-11-11 | 2012-11-05 | Display device |
Country Status (2)
Country | Link |
---|---|
US (1) | US20140328051A1 (en) |
WO (1) | WO2013069584A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10256278B2 (en) * | 2016-12-29 | 2019-04-09 | Au Optronics Corporation | Display device having force sensing function |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104040413B (en) * | 2012-02-13 | 2016-03-23 | 夏普株式会社 | Display device and radiovisor |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060066772A1 (en) * | 2004-09-27 | 2006-03-30 | Kabushiki Kaisha Toshiba | Display apparatus and information terminal |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3847532B2 (en) * | 2000-07-05 | 2006-11-22 | 株式会社日立製作所 | Liquid crystal module and liquid crystal monitor equipped with this liquid crystal module |
JP4103477B2 (en) * | 2002-07-09 | 2008-06-18 | セイコーエプソン株式会社 | Liquid crystal display |
JP4582207B2 (en) * | 2007-09-05 | 2010-11-17 | エプソンイメージングデバイス株式会社 | Electro-optical device and electronic apparatus |
JP2011180362A (en) * | 2010-03-01 | 2011-09-15 | Seiko Epson Corp | Display device |
-
2012
- 2012-11-05 US US14/357,179 patent/US20140328051A1/en not_active Abandoned
- 2012-11-05 WO PCT/JP2012/078567 patent/WO2013069584A1/en active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060066772A1 (en) * | 2004-09-27 | 2006-03-30 | Kabushiki Kaisha Toshiba | Display apparatus and information terminal |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10256278B2 (en) * | 2016-12-29 | 2019-04-09 | Au Optronics Corporation | Display device having force sensing function |
Also Published As
Publication number | Publication date |
---|---|
WO2013069584A1 (en) | 2013-05-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2913706B1 (en) | Liquid crystal display device | |
RU2491472C1 (en) | Illumination device and display device | |
KR102334862B1 (en) | Backlight unit and liquid crystal dispaly device including the same | |
US8556445B2 (en) | Lighting device, display device and television device | |
US9810934B2 (en) | Display device | |
KR20150092408A (en) | Curved backlight assembly and curved display device having the same | |
US20150362652A1 (en) | Lighting device, display device, and television receiving device | |
US8692954B2 (en) | Display device having reduced thickness and improved luminance | |
US20170090230A1 (en) | Display apparatus and digital information display device including a plurality of display apparatuses | |
KR102460231B1 (en) | Backlight unit and liquid crystal dispaly device including the same | |
US10698259B2 (en) | Deformed liquid crystal display device | |
KR20100014113A (en) | Backlight unit, electro-optical device, and electronic apparatus | |
US10197721B2 (en) | Illumination device, display device, and television reception device | |
JP2013041759A (en) | Illumination apparatus, liquid crystal display apparatus and electronic device | |
JP6929725B2 (en) | Backlight device and liquid crystal display device equipped with this | |
JP5303658B2 (en) | Lighting device, display device, and television receiver | |
US20150192824A1 (en) | Display device and television reception device | |
US20120314153A1 (en) | Liquid crystal display device | |
KR20180071613A (en) | Liquid crystal display device | |
US20130135537A1 (en) | Illuminating device, liquid crystal display device and television receiving device | |
CN102789091A (en) | Display apparatus | |
US20170315290A1 (en) | Display apparatus | |
US20140328051A1 (en) | Display device | |
KR20130019974A (en) | Back-light unit and display device having the same | |
US9128229B2 (en) | Backlight device and liquid display device including the same |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SHARP KABUSHIKI KAISHA, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YOKONUMA, SHINSUKE;MINOURA, KAZUNORI;SIGNING DATES FROM 20140425 TO 20140506;REEL/FRAME:032853/0872 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |